Dental engine



ug. 7, 1.928.V A

` w. CORDES DENTAL ENGINE 2 Sheets-Sheet 1 Filed Nov. 15, 1926 Live/z fr lfe' des w. coRDES DENTAL ENGINE Filed Nov.15, 1926 2 Sheets- Sheet 2 Patented Aug. 7,l l928.

:rn rav WALTER CQRDES, OF GOTHA, GERMANY.

DENTAL nNGmE.

Application filed November 15, 1926, Serial No. 148,583, and in Germany January 2, 1926.

In dental teehincs tools executing rotating movements, milling cutters, drills and the like in different shapes are used :tor making sets of teeth and elements vbelonging to the same. The tools required are at present inserted the one after the other into a spindle which can be attended by only one man, which not only causes a considerable loss of time but hinders the dentist in carrying out his work very carefully because he must hold the work with one hand and hold the tool in the other hand. Accurate guiding of the tool relatively to the part being worked upon is Vconsequently impossible and the precise carrying out oit' the work is impeded. In addition, the' clamping chuck is worn rapidly by the repeated exchanging of the tools.

The present invention has 'tor one of its principal objects to attain the absolute quietness and security of operation of such a machine which is essential to the work `ot dentists.

The improved dental engine according to the invention comprises at least three spindles rotated or reciprocated from a common mechanical driving mechanism .and adapted to hold a corresponding number of tools, Vnecessary for the treatment of the work. A y

An embodiment of the invention isrshown,

' by way of example, in the accompanying drawings in which Fig. l is a side elevation of a dental engine embodying the invention. y

Fig. 2 is a plan View of the O'ear box without the cover removed.

Fig. 3 is a side elevation of the head stock of one of the rotatable spindles.

Fig. 4 is aside elevation, partly in section, of a head stock of one of the reciprocating spindles.

Fig. 5 is an elevation, partly in section, of the portion of the driving` shaft which extends through the bottom plate of the gear box.

Figure lGis a. plan view on a larger scale .of the gear box with the cover removed and showing the mechanism therein in greater detail'. Y

Figure 7 is a sectionall elevation of the gear box.

Figure S shows on a still larger .scale the mechanism for driving the rotary tools, and

Figure 9 shows part of the mechanism for driving the reciprocating-tools.

The dental engine comprisesV an upright a, on which va gear box b is mounted, in which gear box any desired number of spindles c are arranged and are rotated from a common driving wheel cl. The spindles c, which project through the side walls of the gear box nb, have each a clamping chuck e each of which chucks is designed to hol-d one of the tools f commonly used in dental technics, i. e. a grinding tool, a. cleaning tool, a finishing tool and polishing means. rEhe spindles are packed, at the point at 'which they extend through the side walls oit' the gear box Z), by packing rings g of felt or other convenient material in order that the lubricating oil may not escape from the easing past the saine.

in order that the engine may be used to actuate reciprocating tools, such as files, saws It and the like, which heretofore had to be manually manipulated, a reciprocating movement is communicated to some of the spindles z' located in the gear box. These spindles i are driven also from the common driving wheel Z and each has a clamping chuck at its outer end for holding al tool and they are oil-tightly packed at the points where they pass through the walls of the box.

All the rotating spindles c and also the reciprocating spindles c' are so constructed that they can be uncoupled, and the rotating spindles c can rotate in both directions.

Push buttons u :tor moving the spindles into and out ot engagement with the driving wheel el extend through the top plate 0 ot the gear box so that any of the spindles can be operated at any moment. The improved dental engine can be used by several dentists simultaneously. The top plate 0 or' the gear box is so constructed asto support the foot p ofa lamp having several arms. Y The gear box is shown as of square cross section but it might be of any other cross section and any number of spindles can be arranged in the gear box and the driving gear may be for any desired ratio of transmission.

The electric motor 7c, supported by the upright a, Figure l. drives by means of a cord the cord pulleyl of the spindle Z which is vertically supported Yin a guide nipple m secured to the bottom ot' gear case b. rEhe spindle Z carries a pinion w which meshes with the main driving gear (Z which is reni trally mounted in the gear case The pinion w has a bell-shaped portion surrounding the upper end of the guide nipple m and ions 5 and 6 mounted loosely on the spindlesV c. @Eitherot the pinions and 6 may be coupled to lthe spindle c on which it is mounted by a claw coupling 7 which is lon` gitudinally slidable on and splined at 8 tol the spindle c. The longitudinal movement ot the claw coupling 7 is eiii-ected by means of the button n carrying at its lower end a fork 9 Vwhich engages with an annular groove 10 of the coupling T. Each button n is movable in a slot 11 in the cover 0 of the gear boX Z) and in a slot 12 in thev bearing housing 12 and is held in any of its positions by means of a spring 13. Owing to this arrangement, only one o the wheels 5 or (i is clutched at the same time with a. spindle @,but both wheels areout of engagement with the claw coupling when the latter is in the central position. The same coupling arrangement is providedior. all the spindles c. In the drawings are shown nine wheels 2 which are in engagement withthe main driving gear d. It follows therefore that each spindle c an be thrown into gear and out of gear with the Vdriving wheel (Z independently of the other spindles, and each spindle can be caused to rotate in either direction according to the direction in which its buttonV n is shifted. y r v The longitudinal reciprocation oi the spindles is also effected by the driving wheel (l. The wheel (Z carries at its center a sleeve 14 on which a crank pin 15 is eccentrically mounted. This crank pin engages in a slot .16V of a guide part 17 which is connected to the hollow guide sleeves 18 for the spindles z'. When the wheel Z is rotated, the crank pin 15 is rotated, and consequently the guide piece .17 and ,also the guide sleeves 18 are horizontally reciprocated. The latter slide in bearings 19 supported by a bracket 20.

A hook 22 extends into each hollow guide sleeve 18 and has its forward end mounted to rock on a pin 21 carried by ay spindle t'. A spring 24 normally tends to move the hooked end of the hook 22 into a slot 23 in the lguide sleeve 18. The lower end of a push pin n normally'bears against'the hook 22 under the vaction of a spring 25 so as to normally hold the hook 22 out of engagement with the slot 23 of the sleeve 18. lIhe push pin nf has a lateral pin 26. IVhen the said pin'- is situated inside its casing 27, which happens when the spring controlled pin n Y is depressed by its spring 25. the hook 22 is disengaged from the slotr23 ofthe guide ihe driving wheel Z meshes with the toothed.

sleeve 18, the spring 24 is compressed, and the corresponding spindle i is prevented from reciprocating. It', however, the spring controlled pin n is pulled upwardly to lift its lateral pin 26 above the upper end of the bearine' 27, and is then turned to cause its lateral pin 26 to rest upon the upper ,edge of the bearing 27, the hook 22, underY the action ci' the spring 24, will engage with the slot 23 ol the guide sleeve 18, and the latter, when reciprocated by the crank.. pin 15 through the guide part 17, will reciprocate its associated spindle z' and the reciprocating tool, suchas a tiling' or sawing tool.

In order to ensure a quiet and secure working, a hand-support Q is varranged under each tool. Said Vsupport also serves to collect the chips from the work. Artableplate r, lined onthe upright a at' a certain distance unfclerneath'the gear box, contains drawers s and supports a vise t or the like so that it can serve as working table.

The dental engine described4 and shown may serve also, it its constructioneis modilied accordingly, for sculptors, goldsmiths, glass cutters, turners, cabinet makers, Y stucco Jorkers, for wood working, for the Vtoy industry and for similar industries. l

The 4advaniaiges obtained are Jthe following:

All known tools, and any otheryforms Vof tools which might be invented and have a certainl likeness to known tools, can be mounted in the machine. All tools which at present are used separately, such' as grinding tools, cleaning tools, finishing tools, and polishing means, can bel mounted inthe dental engine and the operation of the machine does not require special skill.` By means of the dental engine notonly sets of teeth or parts of the same, suclr'as caoutchouc, but also any material as metal alloys, woods, glass, stone, bone, horn, rubber, caoutchouc and india rubber combinations can be treated, ground, cleaned, finished or polished. Y

1. A dental engine, comprising in combination with an upright, a driving engine on said upright, a gear boX'on said upright above said driving engine, a plurality of spindles in said gear box, means for rotating said spindles from said engine, each of said spindles having means for holding a tool for grinding, cleaning, finishing, or polishing, and a plurality of selective means, one for each spindle for communicatingtorsai-dspindles al rot-ating movement, wherebyL any Y one of the spindles may be operated singly or all may be operated simultaneously,`

2. A dental engine, comprising in combination with an upright, driving engine on said upright, a gear box on said; upright above said Vdriving engine,ga pluralityof spindles in said Igear box, means for rotatingr said spindles from said engine, each oi said spindles having means for holding a tool for grinding, cleaning, finishing, or polishing, and selective means for communieating to any one or all of said spindles a reciprocating movement.

3. A dental engine, comprising in combination With an upright, a. driving engine on said upright, a gear box on said upright above said driving engine, a plurality ot spindles in said gear box, each of said spindles having means for holding a tool for grinding, cleaning, iinishing, or polishing, means for communicating from said engine to some ot said spindles a rotating movement and to certain ot said spindles a reciprocating movement, and vvhereby one or all may be operated simultaneously.

4. A dental engine, comprising in combination With an upright, a driving engine on said upright, agear box on said upright above said driving engine, a plurality of spindles in said gear box, means on said spindles for holding a tool for grinding, cleaning, iinishing, or polishing, a common driving disk actuated by said engine for communicating to said spindles a rotating movement, and selective means for causing the disk to drive one spindle at a time or all spindles simultaneously.

5. A dental engine, comprising in combination With an upright, a driving engine on said upright, a gear box on said upright above said driving engine, a plurality of spindles in said gear box, each ot said spindles having means tor holding a tool for grinding, cleaning, finishing, or polishing, and a common driving dislr actuated by said engine for connnunicating to said spindles a rotating movement, and push buttons in the top plate of said gear box 'tor engaging or disengaging said spindles with said driving disk and for reversing the direction of rotation of said rotatable spindles.

G. A dental engine, comprising in combination with an upright, a driving engine on said upright, a gear box on said upright above said driving engine and iilled with lubricating oil up to a certain height, a plurality of spindles located in said gear box and projecting through the Walls oft said gear box, a clamping chuck on each spindle and designed to hold a. tool, means for communicating from said engine to some ot' said spindles a rotating movement and to some of said spindles a reciprocating movement, and selective means whereby one spindle may be operated at a time or all spindles may be ope-rated in unison.

7. A dental engine, comprising in combination with an upright, a gear box on said upright above said driving engine and capable of being filled with lubricating oil up to a certain height, a plurality ot spindles located in said gear box and projecting through the Walls of said gear box, a clamping chuck on Veach spindle and designed to hold a tool, a. guide sleeve carried by the bottom plate ot said gear' box open at its lower end and projecting at its upper end above the oil level in said gear box, a vertical driving shaft projecting into and through said sleeve, a pinion having a high central portion keyed to the top end of said driving spindle and enclosing the upper portion of said sleeve, means for rotating said driving shaft and means for transmitting the rotating movement of said pinion to said spindles.

8. A dental engine, comprising in combination With an upright, a driving engine on said upright, a gear box on said upright above said driving engine, a plurality ot spindles in said gear box, each of said spindles having means for holding a tool for grinding, cleaning, finishing, or polishing, means 'or communicating rotary movement to said spindles from said engine, a top plate on said gear box, a lamp foot on said top plate, and ar lamp having several arms mounted in said toot.

In testimony whereof I have hereunto set my han d.

VALTER CGRDES. 

